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Fluorite

ID: CC20927
This tremendous off-matrix interpenetrant twinned Fluorite is from the Sherry Twins Pocket at Lady Annabella mine, close to the village of Eastgate in Weardale. The pair measure 3.6 x 3.1 x 3.1 cm and 3.2 x 2.3 x 1.8 cm, each with their lower halves’ incomplete from the point of attachment to the vein wall rock. Each crystal is transparent and remarkably gemmy, with a glassy yet slightly waxy lustre and mirror-smooth faces. Most of the Fluorite is a warm honey-sherry yellowish-brown with outer broad zones of near-colourless Fluorite around the faces. In dull sunlight the yellow tones turn to daylight fluorescent warm reddish violet. Under LWUV the crystals fluoresce bright lavender along a buried sub-surface framework mimicking the crystal geometry, while the outer layer and central core are a deeper lilac.

The Lady Annabella mine began specimen recovery operations in July 2020 within the former Eastgate Quarry, previously known as the Blue Circle Cement Quarry. This quarry began in the early 1960s, working an exposure of the Great Limestone, a major formation of Carboniferous age (Pendleian Substage), found across much of Northern England. Following uplift and fracturing, subsequent Fluorite mineralisation pervaded this area of County Durham, in the form of sub-vertical veins and near-horizontal metasomatic flats. Metasomatism is the chemical alteration of rock by hydrothermal fluids. Over the past 55 years, Fluorite from this quarry has become famous amongst collectors for its wide range of colours, colour variations and zonation. In just its first five months of operation, the Lady Annabella mine has produced a magnificent range of Fluorite specimens, many of which are colour variants and mixtures never before seen at this locality, nor even in the other famous mines throughout the Weardale Valley.

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Details

Dimensions
3.2 × 5.0 × 4.0 cm
Categories
Fluorite and Halides, Latest Additions
Locality
Sherry Twins Pocket, Lady Annabella Mine, Eastgate, Weardale, County Durham, England, Europe

Minerals on Specimen

Minerals on specimen
Fluorite

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